a pilot places a helium-filled balloon with a volume of 2.0m^3 in the cargo hold of his airplane. he then flies his airplane to a height in the atmosphere where its volume increases to 6.0m^3. if the temperature remains constant, what is the pressure in kPa, at this height.

a pilot places a helium-filled balloon with a volume of 2.0m^3 in the cargo hold of his airplane. he then flies his airplane to a height in the atmosphere where its volume increases to 6.0m^3. if the temperature remains constant, what is the pressure in kPa, at this height.